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Old 17th Oct 2020, 5:00 pm   #8
ColinTheAmpMan1
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Join Date: Jan 2012
Location: Wimbledon, London, UK.
Posts: 1,362
Default Re: Tektronix 7623A poser

I have got into the HV module an all the transistors (Q1195, Q1190, Q1187) check out as good. However, the inductor L1198 (80uH) is open-circuit and has a cracked end where it contacts with capacitor C1198 (47uF), which itself shows a high resistance (several megohms) but a low capacitance of 13nF. I can get an 80uH inductors from Digikey and probably a 47uF, 25V electrolytic from my parts collection, but why would this all result in the 15v (unreg) fuse (F814, 2A) blowing?

Colin.
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